de waters



Feb. 5, 1929. 1,701,405

, E. A. DEwATERs CRANK CASE VENTILATION Filed Jan. 2, 1926 IU w;

l# Qs s s`0/ l wuemtoz 50S/4.56.' A/ATERS @e .M wif-W1 Patented Feb. 5,619.29. l

f UNITED; v.soffia-,Tias

TION, OF ',DETROIT, IlLIIIGIHIIGrAN,v

- (iRANK-CASE. Application led January asimple, cheap construction for yeffectively removing vapors from the crankcase of an internal combustion engine. As is well vknown these vapors consistof particlesof oil in the form of a line mist, and combustion chamber yproducts which leak past the pistons, these products consisting principally of burnt gases and a small proportion of water vapor. If allowed to lremain in the crankcase, the combustionv chamber products condense and effecta dilution of the'lubricating, oil .which is very undesirable.

lAccording to my invention suction is applied to a compartment in communication with the crankcase and housing auxiliary mechanism. This suction results in drawing vapors out of the crankcase by way of the compartmentand removing them from the engine.` f

My particular constructionconsists in applying over the louvered openings in the cover for the overhead valves, such as shown in m prior application Ser. No. 693,634,

" filed 4 eb. 18, 1924, a tubular member through which a stream of air is passed, this stream` inducing a flow of vapors out of the valve compartment. While the iow of air may be produced in a number of ways I have pret'erred to employ a portion of the air stream produced by the action of the usual coolin Ian as well as the motionof the vehicle an have provided the tubular member with a funnel shaped portion facing in the direction of the air stream to facilitate the reception of the air. Y

In the drawings:

Figure 1 is a side elevation of a Buick engine showing my Ventilating device applied thereto.

Figure 2 is a section through the engine n showing the path 'of the cranlrcase vapors.

Figure 3 is an enlarged longitudinal section through the Ventilating device.

In the drawing, the'reference character 2` indicates the crankcase, 4 the usual'cooling fan, and 6 the valve compartment.k It will be noted that the engine illustrated is provided with overhead valves but the invention is equally applicable where the valve compartments are arranged alongside the cylinders. The valvemechanism comprises customary rocker arms 8 and tappet rods 10 extending into the crankcase where they are engaged by the usual cam shaft 12. The tap'- PATENT OFFICE,

ENOS A. DE WATERS, OFTLINT, MICHIGAN, AssIGNoR To GENERALMoToRs coRPoBA- A `CORPORATION oFfDELAWARE. Y

VENTILATION.

2, 192e. NseriaiNavams.

pet rods are provided Withsuitable guidesr13 fitting in a-'notched seat in theV ,top of the crankcase permitting the passage of vapors from the crankcase through the tappet rod compartment 14 `to the Lvalve 'compartment 6. If desired vother openings may also be provided in the top of the crankcase for the passageof vapors.

I-have provided the cover `18 of the overhead valve compartment with hooded apex'` tures 20 formed by pressing outY portions of the metal ofthe cover. Over these apertures I have arranged a tubularmember 22 through which an air stream is passed to cause a How of vapors out of the openings 20 and their discharge away from the engine. While the stream of air may besecured in a number of Ways, as by theusefof engine suction, I have preferred tojmakeuse of the blast of the usual cooling fan 4, aswell as the stream vof air resulting from the motion of the ve-v hicle. .In order to best utilize these currents I have provided the forward end of member 22 with an outwardly flared or funnel .shaped portion 24 for collectin the currents of air and conducting vthem into the tube.v The otherend of the tube is preferably open so that the products drawn out of the valve chamber are discharged outside of the en ine, although it isobvious that if desired t ese products might be led to the intake manifold for consumption in the engine. v

- In operation, the air stream passing through the member 22 induces a ilow of vapors from the crankcase upwardly through the tappet rod compartment 14 and valve chamber 6 and through openings 20 into the passing air current. It will also be noted that the manner of :tormationfof the hooded openings 20 is such that the cross section of the passage through the tubular member is reduced adjacent theopenings 2O so that the air stream is movin'gwith higher velocity at these points with oonsequentgreater aspirating effect. Attention is also called to the fact that the openings 20 are distributed along the length ofthe engine so that vapors throughout the length of the crankcase are subjected to suction.

f I claim:

1. An internal combustion engine having a crankcase, a compartment for auxiliary mechanism in communication with the crankn case, a cover for said compartment, an openv tendingalong said cover and over said open# ing, said tubular member' being adapted to convey an air current over said opening to dravv vapors therefrom. Y

2. In the combination as defined by claim l, said opening being provided With a hood, the hood projecting into said tubular member, reducing the cross section of the air passage, and increasing the velocity of air flow past the opening. i

3. In the combination as delined by claim l, said engine being provided with the usual cooling an and said tubular member having the end adjacent the fan of enlarged cross section for receiving the tan blast.

l. An automobile engine having a crankcase, a valve compartment communicating with the crankcase, a cover lfor said compartment, said cover being provided with a plurality of openings distributed along the length el the engine, and a. tubular member extending along said cover and overlying said openings, said tubular member being adapted tol convey an air current over said openings to draw vapors therefrom.

5. An automobile engine having a crankcasea valve compartment in connnunication With the cranlroase, a cover for said valve Compartment, said @over being provided with funnel shaped entrance portion facing in' the direction of the air current.

7. An internal combustion engine having a crankcase, a valve compartment, said engine being formed ywith a plurality otpas#l sages spaced longitudinally of the engine establishing valve compartment and the crankcase, a cover tor said compartment, said'eover'being provided4 with av plurality ofy openings distributed alongthe length ofthe engine, and a tubular member. extending along said cover and overlying said openings, said tubular memberbeing adapted to conveyan air'current over said openings to draw vapors therefrom, the distribution of said passages and openings causing the Ventilating streamV to traverse substantially the entire cross sec tional area of the orankoa'se. 4

In testimony ivliereofl affix my signature.

ENOS A. DE XVATERS.

communication between the 

